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Grid Computing at DESY
Andreas Gellrich*
DESY
HEPiXHEPNT, Fall 2004, BNL21 October 2004
*presented by Patrick Fuhrmann
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Contents
• Introduction
• Grid Projects at DESY
• Grid Infrastructure at DESY
• Grid Applications at DESY
• Conclusions
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Introduction
• DESY is one of the worldwide leading centers for research with particle accelerators and synchrotron light
• DESY operates the electronhadron storage ring HERAII with three running experiments (H1, HERMES, ZEUS)
• DESY is a Tier0/1 centre for the HERA experiments
• DESY has traditionally not been involved in CERN experiments and is therefore not part of LHC / LCG
• DESY supports the Physics Institutes of the University of Hamburg in their CMS Grid activities
• DESY has identified Grid as a strategic technology for the future
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at DESY
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EGEE
applications
network
EGEE@DESY
• Enabling Grids for ESciencE• EU 6th Framework Programme (FP 6)• Started on April 1st, 2004• 70 partners in 27 countries• federated in 10 regional Grids• Headquarter: CERN
• DESY is in D/CH federation• DESY, DKRZ, FhGSCAI, FZK, GSI• DESY is in SA1 (operating a Grid infrastructure)• DESY is funded with ~ 2FTEyears
• DESY provided resources for the GridKa School
• http://www.euegee.org/
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DGRID@DESY
• R&D programme for a national escience infrastructure• DESY is founding member of the HGF institutes
• Organization in 6 communities
• Anticipated programme start is January 1st, 2005, for 3 year• Funding volume of 20 MEUR• Project proposal are due on October 22nd, 2004
• A handful of community specific projects and 1 integration project
• DESY leads HEP Community Project (CP) • DESY participates in the Integration project (IP), led by GridKa• DESY brings in knowhow and experiences in data management
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ILDG@DESY
• In Lattice QCD (LQCD) costly simulations socalled configurations, performed on High Performance Clusters are the basis for research activities
• The International Lattice DataGrid (ILDG) was started with the aim of making gauge field configurations available to an international group of scientists using Grid technologies
• Each configuration submitted to ILDG will consist of a set of metadata and a set of binary files
• In the context of the German Lattice Forum (LATFOR) DESY is setting up a Data Grid testbed, exploiting the common Grid infrastructure, in particular the catalogue services
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LCG@DESY
• Some physics institutes of the University of Hamburg are located on the DESY site
• DESY supports the institutes by providing computing infrastructure
• The Institute for Experimental Physics is partner of the CMS collaboration at LHC
• In a joint effort between DESY and the institute a Grid infrastructure to enable LCG on site will be installed
• Their Grid hardware is incorporated in the common DESY Grid infrastructure
• In cooperation with the University of Aachen a CMS Tier2 centre is planned in Germany
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dCache@DESY …
D2 D2 D2
D2 D2 D2
D2D2D2
DMZ
D2
Z Z Z
C C C C C
C C C C C
C C C C C
C C C C C
C Central Cache HH
Local HH
Local Zeuthen
D2 Pre Cache HHZ Cache Zeuthen
World
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… dCache@DESY
dCache Deployment
• Working together with Ian Birds deployment gang• dCache developers will be at CERN next week to get into
residual technical issues.• CERN member will be at DESY mid of Nov. to create/improve
installation and operating manuals.• Improving installation for very small installations.• DGrid initiative : proposal : 'Scalable Storage Element'• we need your feedback about installation and operating issues
[email protected]• most recent 'rpm' on www.dCache.ORG should already be easy
to install.
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Grid Infrastructure at DESY• DESY installed and operates a complete and independent Grid
infrastructure which provides generic Grid services to all experiments and groups a DESY
• The DESY Production Grid is based on LCG_2_2_0 and includes:Resource Broker (RB), Information Index (BDII), Proxy (PXY)Local Replica Catalog (LRC), Meta Data Catalog (MDC)27 nodes, incl. 17 WNs (34 CPUs)dCachebased SE with access to the entire DESY data space of 0.5 PB
• Certification services for DESY users in cooperation with GridKa
• VO management for the HERA experiments (‘hone’, ‘herab’, ‘hermes’, ‘zeus’), LQCD (‘ildg’), ILC (‘ilc’), Astroparticle Physics (‘baikal’, ‘icecube’)
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DESY Production Grid …
Site CSite B
output
dcap
UICAT
WN WN WNWN
dCacheSEG
RISCE
GR
IS
BDII
JDLRB
PBS
LRC/MDC
VORBCESE
/etc/gridsecurity/gridmapfile
Site A
ssh
$HOME/.globus/
certs
ldap://gridvo.desy.de/ GIIS
disk tape
gridui gridrb
gridcat
gridvo gridce
grid100110
gridse
world
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DESY Production Grid: Classical Setup
Globusgatekeeper
GRAM
PBSserver
PBSclient PBSclient PBSclient PBSclient
WN1 WN2 WN3 WN4
CE
Computing resources
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DESY Production Grid: Federating Resources
Globusgatekeeper
GRAM
PBSclient PBSclient PBSclient PBSclient
Globusgatekeeper
GRAM
Globusgatekeeper
GRAM
WN1 WN2 WN3 WN4
CE1 CE3CE2
PBSserver
Federated computing resources
VO specific queues
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… DESY Production Grid …•rackmounted 1U servers•dual Intel P4 XEON 2.8 GHz•2 GB DDRAM•GigaBit Ethernet•80 GB (E)IDE system disk•200 GB (E)IDE data disk
•10 Gbit/s DESY backbone•1 Gbit/s WAN (GWIN)
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… DESY Production Grid …gridce.desy.de
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… DESY Production Grid …
• Security aspects:DESY uses sophisticated firewall settingsServices are planned to run in a DMZ (partly already achieved for dCache services)
• Installation Experiences:Manual installation on SuSEbased DESY Linux clumsyLCFGngbased easierWaiting for common HEP Linux (SL3) and Quattor (?)
• Operational Experiences:AFS and NIS/YP on UIs highly welcomed by usersdCachebased SE operationalLDAPbased globusmds lacks scalabilityRGMA not yet considered
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The Challenge
• HERAII drives the demand for MC production• The paradigms of resource sharing are changing.
• H1 used to distributes the MC production to dedicated sites which have now started to join the LCG and deploy Grid technologies.
• ZEUS has run the MC production system funnel for a decade with collaborating sites. Many of them have started to join LCG.
• The International Linear Collider (ILC) Detector group group aims on data exchange and MC simulation using the Grid. By using the dCachebased SE and the Catalogue Services, the entire DESY data space is presented to the Grid.
• H1 and ZEUS distribute their experimentspecific software via replica management to SEs than installing locally
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The H1 MC Schema
Split the input into files20000 events/file, 5kb eache.g.30mio events = 150Gb
ACStape
Batch(PBS)
node
node
nodeSteeringnode
H1farm
each node: local disk 200GbH1 environment (incl. execs)noise files ~7GbOracle databaseoutput DST1500 jobstatus files
When all done, copy the output from each node (to avoid acs fragmentation)
Generated events jobs
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ZEUS MC Production …
KEK
Rutherford
Montreal
Tel Aviv
Bonn
...
Funnel Sites
ZEUS IntegratedProduction System
Grid Sites
RAL
Scotgrid
DESY
…
ZEUS Grid Gateway
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… ZEUS MC Production
• The Grid Sites are currently being integrated in the ZEUS Integrated MC Production system (ZIMP) in addition to funnel
• ZIMP provides user request portals, bookkeeping, statistics, and monitoring and plans for automated production services
• Besides DESY, RAL, ScotGrid (Glasgow), Universities of Hamburg, Dortmund, and Karlsruhe currently support the VO ‘zeus’
RAL
21 Sep 2004
• 0.5 M events have been produced on the Grid so far
• 84 k events produced at RAL
• Data Quality Management (DQM) has been successfully applied
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Conclusions
• We hope you are convinced why and how DESY deploys a Grid Infrastructure
• The HERAII programme drives the demand for MC production• Changing paradigms of resource sharing requires Grid
technologies• Recently started projects expect the Grid to be available on site
• The DESY Production Grid provides a common Grid infrastructure, including all generic Grid services
• The HERA experiments as well as some globally active groups have started to exploit the Grid to share resources with outside partners
• For DESY, the Grid has become a strategic technology